If you are going anywhere with a lower gravity than kerbin, you could do without the ladders, save yourself a little weight. Also, you might want to lose the photovoltaic panels and replace them with the tiny panels, which you have at the top. I suggest replacing the fins with them. Other than this, you should be able to get to eve, duna, and maybe dres or moho. I dont suggest landing on eve though. As long as you spread your ∆v by aerobraking and using gravity assists, you might be able to get to jool, but you would have to stay there a while if you want to get back.